Tutorial by Examples: r

Routes with placeholders

Using YAML: # app/config/routing.yml blog_show: path: /blog/{slug} defaults: { _controller: AppBundle:Blog:show } Using Annotations: // src/AppBundle/Controller/BlogController.php namespace AppBundle\Controller; use Symfony\Bundle\FrameworkBundle\Controller\Controller; use S...

symfony • Routing

Default values for placeholders

If you want to have a placeholder that may be omitted, you can give it a default value: Using YAML: # app/config/routing.yml blog_list: path: /blog/{page} defaults: { _controller: AppBundle:Blog:list, page: 1 } requirements: page: '\d+' Using Annotations: // src/...

symfony • Routing

A simple controller class

// src/AppBundle/Controller/HelloWorldController.php namespace AppBundle\Controller; use Symfony\Component\HttpFoundation\Response; class HelloWorldController { public function helloWorldAction() { return new Response( '<html><body>Hello World!<...

symfony • Controllers

Rendering a Twig template

Most of the time, you will want to render HTML responses from a template instead of hard-coding the HTML in your controller. Also, your templates will not be static but will contain placeholders for application data. By default Symfony comes with Twig, a powerful templating language. In order to us...

symfony • Controllers

Returning a 404 (Not Found) page

Sometimes you want to return a 404 (Not Found) response, because the requested resource does not exist. Symfony allows you to do so by throwing a NotFoundHttpException. The Symfony base Controller exposes a createNotFoundException method which creates the exception for you: public function indexAc...

symfony • Controllers

Using data from the Request object

If you need to access the Request object (for instance to read the query parameters, to read an HTTP header or to process an uploaded file), you can receive the request as a method argument by adding a type-hinted argument: use Symfony\Component\HttpFoundation\Request; public function indexActio...

symfony • Controllers

Reading from memory

libavformat usually takes in a file name and reads media directly from the filesystem. If you want to read from memory (such as streams), do the following: // Define your buffer size const int FILESTREAMBUFFERSZ = 8192; // A IStream - you choose where it comes from IStream* fileStreamData; ...

ffmpeg • Reading Media

Reading from a file

Opening a media file from the local file system. AVFormatContext *formatContext; // Open the file if(avformat_open_file(&formatContext, "path/to/file.ogg", NULL, NULL) < 0){ // Error opening file } // Do something with the file // Free resources avformat_close_inpu...

ffmpeg • Reading Media

Reading from a format context

Formats contain one or more encoded and muxed streams. We usually read these in chunks, which are often called frames (though in certain cases, FFmpeg refers exclusively to decoded, raw media chunks as frames, and encoded chunks as packets, which may be confusing). To read a single frame from a form...

ffmpeg • Reading Media

Reading from an IStream in a IOContext

The API call avio_alloc_context, which sets up a custom IO context, takes in a pointer to a Read function. If you are reading from an IStream, you can use the following: /** * Reads from an IStream into FFmpeg. * * @param ptr A pointer to the user-defined IO data structure. * @param b...

ffmpeg • Reading Media

Seeking within an IStream in an IOContext

The API call avio_alloc_context, which sets up a custom IO context, takes in a pointer to a Seek function. If you are reading from an IStream, you can use the following: /** * Seeks to a given position on an IStream. * * @param ptr A pointer to the user-defined IO data structure. * @pa...

ffmpeg • Reading Media

Find a stream

Media stream containers usually have a several streams, such as a video stream and an audio stream. For example, you can get the audio stream using the following: // A Format Context - see Reading Data for more info AVFormatContext *formatContext; // Inspect packets of stream to determine prope...

ffmpeg • Decoding

Decode frames

Given a codec context and encoded packets from a media stream, you can start decoding media into raw frames. To decode a single frame, you can use the following code: // A codec context, and some encoded data packet from a stream/file, given. AVCodecContext *codecContext; // See Open a codec cont...

ffmpeg • Decoding

CircleCI integration with Selenium Python and Unittest2

Circle.yml machine: python: # Python version to use - Selenium requires python 3.0 and above version: pypy-3.6.0 dependencies: pre: # Install pip packages - pip install selenium - pip install unittest test: override: # Bash command to run main....

selenium-webdriver • Selenium-webdriver with Python, Ruby and Javascript along with CI tool

dispatcher-servlet.xml

This is the important configuration file where we need to specify the ViewResolver and View components. The context:component-scan element defines the base-package where DispatcherServlet will search the controller class. Here, the InternalResourceViewResolver class is used for the ViewResolver. ...

spring • Understanding the dispatcher-servlet.xml

dispatcher servlet configuration in web.xml

In this XML file, we are specifying the servlet class DispatcherServlet that acts as the front controller in Spring Web MVC. All the incoming request for the HTML file will be forwarded to the DispatcherServlet. <?xml version="1.0" encoding="UTF-8"?> <web-app version...

spring • Understanding the dispatcher-servlet.xml

CASE in ORDER BY clause to sort records by lowest value of 2 columns

Imagine that you need sort records by lowest value of either one of two columns. Some databases could use a non-aggregated MIN() or LEAST() function for this (... ORDER BY MIN(Date1, Date2)), but in standard SQL, you have to use a CASE expression. The CASE expression in the query below looks at th...

SQL • CASE

Adding the axWindowsMediaPlayer

Right-click on the Toolbox, then click "Choose Items". Select the COM Components tab, and then check Windows Media Player. axWindowsMediaPlayer will be added to Toolbox. Select this checkbox to use axWindowsMediaPlayer Then you can use axWindowsMediaPlayer :)

Visual Basic .NET Language • Using axWindowsMediaPlayer in VB.Net

Getting a query string parameter

Lets say we want to build a paginated list of products, where the number of the page is passed as a query string parameter. For instance, to fetch the 3rd page, you'd go to: http://example.com/products?page=3 The raw HTTP request would look something like this: GET /products?page=3 HTTP/1.1 Ho...

symfony • The Request

Creating a Request object from global variables

PHP exposes a number of so-called global variables which contain information about the HTTP request, such as $_POST, $_GET, $_FILES, $_SESSION, etc. The Request class contains a static createFromGlobals() method in order to instantiate a request object based on these variables: use Symfony\Componen...

symfony • The Request